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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 33 · 40 questions
TalentJR

The fast method (Step from a neighbour): Find the round neighbour and square it: 70² = 7 × 7 = 49, then two 0s → 4900. Ends in 1 (one more)? Add the round number and the number: 4900 + 70 + 71. Ends in 9 (one less)? Take them away: 69² = 4900 − 70 − 69 = 4761.

NameDateTime takenScore ___ / 40
  1. 1.79² =
  2. 2.21² =
  3. 3.49² =
  4. 4.59² =
  5. 5.29² =
  6. 6.89² =
  7. 7.29² =
  8. 8.81² =
  9. 9.51² =
  10. 10.69² =
  11. 11.51² =
  12. 12.51² =
  13. 13.41² =
  14. 14.91² =
  15. 15.71² =
  16. 16.29² =
  17. 17.21² =
  18. 18.41² =
  19. 19.61² =
  20. 20.71² =
  21. 21.49² =
  22. 22.41² =
  23. 23.51² =
  24. 24.21² =
  25. 25.29² =
  26. 26.29² =
  27. 27.51² =
  28. 28.49² =
  29. 29.49² =
  30. 30.39² =
  31. 31.51² =
  32. 32.69² =
  33. 33.71² =
  34. 34.21² =
  35. 35.19² =
  36. 36.19² =
  37. 37.39² =
  38. 38.91² =
  39. 39.29² =
  40. 40.39² =

Answer key

  1. 6241
  2. 441
  3. 2401
  4. 3481
  5. 841
  6. 7921
  7. 841
  8. 6561
  9. 2601
  10. 4761
  11. 2601
  12. 2601
  13. 1681
  14. 8281
  15. 5041
  16. 841
  17. 441
  18. 1681
  19. 3721
  20. 5041
  21. 2401
  22. 1681
  23. 2601
  24. 441
  25. 841
  26. 841
  27. 2601
  28. 2401
  29. 2401
  30. 1521
  31. 2601
  32. 4761
  33. 5041
  34. 441
  35. 361
  36. 361
  37. 1521
  38. 8281
  39. 841
  40. 1521

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